PH, (pH):

A scale that allows you to classify substances according to their acid content (values ​​less than 7) or alkaline (values ​​higher than 7, up to 14 - very alkaline, neutral: 7).


It is the negative logarithm of the concentration of hydrogen ions. A numerical scale used to measure the acidity and basicity of a substance. Absolute value of the decimal logarithm of the concentration of hydrogen ion (activity). Used as an indicator of acidity (pH <7) or alkalinity (pH> 7).



1. The term pH comes from the combination of the letter p of the word power and the letter H of the symbol of the element hydrogen. Together, these letters mean the power or exponent of hydrogen.


2. Measurement of the concentration of hydrogen ions in a solution, expressed as the logarithm (base ten) of the reciprocal value of the concentration of hydrogen ions in grams mol per liter (g / mol / l).


3. Expression of the intensity of the acidic or basic conditions of a liquid (or a suspension in the case of soils); mathematically it is the logarithm in base 10 of the reciprocal of the ionic concentration of hydrogen in moles per liter in a solution, and it can vary between 0 and 14, where 0 is the most acidic and 7 is neutral.

Natural waters usually have a pH between 6.5 and 8.5.


4. Expression in number of the acidity or alkalinity of a solution, water, soil, etc.

The scale ranges from 0 to 14. It is represented on a scale from 0 to 14. The value 7 corresponds to the neutral state, the value zero to the most acid and the value 14 to the most alkaline.


5. In chemistry, a quantitative measure of the acidity or basicity (alkalinity) of a liquid solution. A measure of the acidity or alkalinity of a liquid or solid material. The concentration of hydrogen ions is an important parameter of both natural waters and sewage, since the existence of a large part of biological life is only possible within the narrow limits of variation of that parameter.

Wastewater (residual, black) with adverse hydrogen ion concentration is difficult to treat by biological means and, if the pH has not been modified before being discharged into natural waters, the effluents will certainly alter those natural waters. This parameter is of enormous interest in ecology, together with temperature and humidity, because most of the living beings respond to them.


PH: Measurement of the acidity or alkalinity of a solution. It is defined as the negative logarithm of the concentration of hydrogen ions (H +). The scale goes from 0 to 14 units, with the value of 7 corresponding to neutrality.


PH: Measurement of the acidity or basicity of a solution. The pH scale varies from 0 to 14, being considered neutral those that have a pH 7, acid less than 7 and basic or alkaline, higher than 7. The pH is an important quantity in the aquatic and edaphic ecosystems.


PH: Symbol that represents the relative concentration of hydrogen ions in a solution. The pH values ​​range between 0 and 14. pH 7 is neutral, less than 7, acid and more than 7, alkaline.


PH: Hydrogenase factor. pH = -log {H +}. Minus the base 10 logarithm of the molar concentration of hydrogen or hydronium ions (H3O +); pH = log 1 / {H +}. Indicates the concentration of hydrogens or hydroxyl ions in an aqueous solution. It can have values ​​from 0 to 14. A pH of 7 corresponds to neutrality, acidity to a pH less than 7 and alkalinity to a pH greater than 7.


pH: * It is a measure of the concentration of the hydrogen ion in water. The concentration of this ion is expressed as pH, and it is defined as the changed decimal logarithm of the concentration of hydrogen ion.

* Symbol that is used for the concentration of hydrogenols, the pH values ​​range from 0 to 14, corresponding a pH value of 7 if it is neutral being less than 7 acid and greater than 7 alkaline.

Concentration of the hydrogen ion and the acidity of aqueous solutions. Pure water has a pH of 7 and is considered neutral. Above it is basic solutions and below acid solutions. Rainwater ranges between pH 4.6 and 5.6


PH: Degree of acidity or alkalinity of the soil. Below 7.0 ph, it is acidic soil, above it is alkaline earth.


pH: Represents the logarithm negative in base 10 of the activity of the hydrogen ions of solution in moles per liter, a measure of the acidity (pH less than 7) or of the alkalinity (pH greater than 7) of a solution.


pH: System used to determine the concentration of H + ions in a solution. Chemical measurement of the acidity or alkalinity of a solution or substance. It represents the negative logarithm in base 10 of the activity of the hydrogen ions of solution in moles per liter. If it is less than 7, it corresponds to an acid solution and if it is higher (up to 14) it corresponds to an alkaline solution.


Ph: Parameter that indicates if an aqueous solution is acidic, Ph <7, basic, Ph> 7, or neutral, Ph = 7. Ph is defined as the antilogarithm of the concentration of hydrogenols expressed in moles per liter.


Ph: It is the quantitative expression of the acidity or alkalinity of a solution, a soil or other means. That is, it is the concentration of hydrogen (H +) or hydroxyl (OH-). The scale ranges from 0 to 14. Corresponding neutrality to a Ph 7 the Ph lower than 7, indicates acidity, and higher than 7, alkalinity. The true concentration of hydrogenols increases or decreases ten times for each unit of Ph. Ph is a parameter of enormous interest in ecology, together with the temperature and degree of humidity, to which most plants respond.


PH: Measurement of the concentration of the hydrogen ion in solution or any of its hydrated forms. As the solutions that are usually used for acids and bases are diluted and can also vary over a large interval, Sorensen proposed a notation, which consists of characterizing the acidity or basicity (they are reciprocal concepts) of a negative logarithmic scale, the so-called pH scale. . medium acid pH <7 neutral medium pH = 7 basic medium pH> 7.


pH: Abbreviation of the hydrogen potential, represents the acidity or alkalinity of a solution and is defined from the dissociation of water in ions (H +) and (OH-) where the product of the concentrations (H +) and (OH-) ) is constant and is 10-14, in chemistry the pH is expressed according to pH = log (H +).


pH: The value that determines if a substance is acidic, neutral or basic, calculated by the number of hydrogen ions present. It is measured on a scale from 0 to 14, in which 7 means that the substance is neutral. Values ​​of pH below 7 indicate that the substance is acidic and values ​​above 7 indicate that the substance is basic.


PH: Potential hydrogen of any solution, taking as reference the antilogarithm of the concentration of ionic hydroxyls present in the solution. The scale of 1 (super acid) and 14 (superbasic or alkaline) has the equilibrium point (neutrality) in 7, which is considered neutral pH, registered in pure water.


pH: Symbol that represents the relative concentration of hydrogen ions in a solution; the pH values ​​range from 0 to 14, and at less value, higher acidity, that is, a greater number of hydrogen ions; pH 7 is neutral, less than 7 acid and more than 7 is alkaline.


pH: It is the concentration of the hydrogen ion found in the soil, which will indicate the degree of alkalinity or acidity of a soil.


pH: measurement of the acidity or basicity of a solution. The pH scale varies from 0 to 14, being considered neutral those that have a pH 7, acid less than 7 and basic or alkaline, higher than 7. The pH is an important quantity in the aquatic and edaphic ecosystems.


pH: Name of the scale that measures the value of the acidity or alkalinity of a substance. Its values ​​range from 0 to 14. A value of 7 is considered neutral, while below the value corresponds to an acidic matter and above an alkaline.


pH: Hydrogenic power, which is the unit of measurement of the acidity and basicity of water. In aquatic ecosystems the pH is a function of the amount of dissolved CO2 and is an indicator of the metabolism of animal and plant communities, as regards their photosynthesis and respiration. In the waters of the surface sea, the average value of the pH is around 8.2. The highest values, for example 8.9, coincide with high values ​​of chlorophyll and oxygen. In the bottom waters, the decreases occur in coincidence with the lack of oxygen and with the formation of toxic substances, for example ammonia and hydrogen sulfide, which are harmful to the living species of the marine world. The sea water, thanks to its high level of "buffer", is in any case able to contain the pH variations.


PH: Hydrogen potential. Measurement of the acidity or basicity of a solution. An acid has a ph between 0 and 7; the basic, between 7 and 14; the neutral in 7.